Hi,

I'm sorry to inform you that my patch isn't working properly.
It's only my fault: I misunderstood the code of ssystem3 (and ssystem4).

I'll come back when I have a solution, but it will be probably not a simple patch.

With apologies,

mychess

Hmm? What's wrong with your patch?
In my tests (with the 2 posted positions) it works fine, i.e. the engine(s) are in fact castling.

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Hi Fhub,

In many chess computers, bits are used to indicate if castlings are possible.
When the rook or the king moves, bit change to forbid castling.
In ssystem3|4, bits are used to indicate that king and rooks are at initial positions.
With my patch, you can make a "white little castling" with a black knight in H1, the code does not check the type or color of the piece in H1!!!

Sorry for the workload.

Cordialy.

mychess

Hi Mychess,
oops, that's indeed a strange method!
I guess that it will be impossible to fix this directly in the ROM - in the MessChess plugins I can do this,
but first I'll have to find out which bit corresponds to which rook.
And I hope that there's not a similar bit anywhere for the 2 kings ...

Edit: Ok, in the MessChess-Plugin I've fixed it now for both engines (ssystem3/4) - thanks for this information!

Regards,
Franz

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Well, I think you shouldn't waste your time with this patch (which is almost impossible in assembly language).
If these ssystem3/4 programs don't accept castlings after a position setup, then we should just accept it - take it as a 'feature'.
And in MessChess it's already working with the new plugin, so it's not really a problem.

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Hi...


Vielen Dank für eure großartige Unterstützung. Dank dieses Patches, kombiniert mit einer EPD-Datei, die über 11.000 Eröffnungsstellungen umfasst, und der jetzt zulässigen Rochade wirkt das Spiel mit dem Mark 3 deutlich abwechslungsreicher.

Gruß
Mark 1